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Financial Assets at Fair Value through Other Comprehensive Income Noncurrent - Summary of Financial Assets at Fair Value through Other Comprehensive Income Noncurrent (Detail)
$ in Millions, $ in Millions
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Disclosure of financial assets [Line Items]      
Financial assets at fair value through other comprehensive income $ 4,667 $ 142 $ 4,412
Domestic listed stocks [Member]      
Disclosure of financial assets [Line Items]      
Financial assets at fair value through other comprehensive income 126   243
Domestic non-listed stocks [Member]      
Disclosure of financial assets [Line Items]      
Financial assets at fair value through other comprehensive income 3,874   3,734
Foreign non-listed stocks [Member]      
Disclosure of financial assets [Line Items]      
Financial assets at fair value through other comprehensive income $ 667   $ 435